As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW COMMENTS: SHORTLY AFTER APPLYING APU AIR TO PACKS, SMOKE BEGAN APPEARING IN COCKPIT AND CABIN. FOUND OIL LEAKING IN APU AT BLEED DUCT OUTLET. SMOKE DISSIPATED RAPIDLY. FOUND OIL LEAKING IN APU BLEED OUTLET. ALSO APU FUEL LINE LEAKING AT FIREWALL BETWEEN UNION AND FUEL LINE TO APU. APU NEEDS TO BE REPLACED. REPLACED APU.